Yes Eric, sorry by my mistake.
My problem is that my Mobile Documents was empty. I've tried to restore its content from Time Machine without success.
In order to overpass this problem I decided to delete the Mobile Documents folder and then restore the whole folder from Time Machine. When you delete the Mobile Documents folder, the system, automatically, creates another new one. This new Mobile Documents folder contains a iCloud Drive folder and a folder for every App that iCloud is configured to store its data. Besides every of these folders a little cloud with a down arrow icon appears whit a message "Waiting for Downloading" when cursor points over the little cloud icon.
I suppose the system is downloading data from iCloud but this situation lasts for more than 18 hours.
It's this normal?
Thanks